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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of changes in AOCI attributable to Enbridge Inc. common shareholders | Changes in AOCI attributable to our common shareholders for the nine months ended September 30, 2018 and 2017 are as follows:
| Cash Flow Hedges |  | Net Investment Hedges |  | Cumulative Translation Adjustment |  | Equity Investees |  | Pension and OPEB Adjustment |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Balance as at January 1, 2018 | (644 | ) | (139 | ) | 77 |  | 10 |  | (277 | ) | (973 | )
Other comprehensive income/(loss) retained in AOCI | 167 |  | (232 | ) | 1,495 |  | (8 | ) | — |  | 1,422 |
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 92 |  | — |  | — |  | — |  | — |  | 92 |
Commodity contracts 2 | (1 | ) | — |  | — |  | — |  | — |  | (1 | )
Foreign exchange contracts 3 | 6 |  | — |  | — |  | — |  | — |  | 6 |
Other contracts 4 | 10 |  | — |  | — |  | — |  | — |  | 10 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 36 |  | 36 |
| 274 |  | (232 | ) | 1,495 |  | (8 | ) | 36 |  | 1,565 |
Tax impact |  |  |  |  |  |  |  |  |  |  |  |
Income tax on amounts retained in AOCI | (26 | ) | 32 |  | — |  | 9 |  | — |  | 15 |
Income tax on amounts reclassified to earnings | (29 | ) | — |  | — |  | — |  | (8 | ) | (37 | )
| (55 | ) | 32 |  | — |  | 9 |  | (8 | ) | (22 | )
Balance as at September 30, 2018 | (425 | ) | (339 | ) | 1,572 |  | 11 |  | (249 | ) | 570 |
| Cash Flow Hedges |  | Net Investment Hedges |  | Cumulative Translation Adjustment |  | Equity Investees |  | Pension and OPEB Adjustment |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Balance as at January 1, 2017 | (746 | ) | (629 | ) | 2,700 |  | 37 |  | (304 | ) | 1,058 |
Other comprehensive income/(loss) retained in AOCI | 29 |  | 496 |  | (2,616 | ) | (4 | ) | — |  | (2,095 | )
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 104 |  | — |  | — |  | — |  | — |  | 104 |
Commodity contracts 2 | (5 | ) | — |  | — |  | — |  | — |  | (5 | )
Foreign exchange contracts 3 | (2 | ) | — |  | — |  | — |  | — |  | (2 | )
Other contracts 4 | (3 | ) | — |  | — |  | — |  | — |  | (3 | )
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 21 |  | 21 |
| 123 |  | 496 |  | (2,616 | ) | (4 | ) | 21 |  | (1,980 | )
Tax impact |  |  |  |  |  |
Income tax on amounts retained in AOCI | (9 | ) | 9 |  | — |  | 13 |  | — |  | 13 |
Income tax on amounts reclassified to earnings | (34 | ) | — |  | — |  | — |  | (8 | ) | (42 | )
| (43 | ) | 9 |  | — |  | 13 |  | (8 | ) | (29 | )
Balance as at September 30, 2017 | (666 | ) | (124 | ) | 84 |  | 46 |  | (291 | ) | (951 | )
1 | Reported within Interest expense in the Consolidated Statements of Earnings.
2 | Reported within Commodity costs in the Consolidated Statements of Earnings.
3 | Reported within Other income/(expense) in the Consolidated Statements of Earnings.
4 | Reported within Operating and administrative expense in the Consolidated Statements of Earnings.
5 | These components are included in the computation of net periodic benefit costs and are reported within Other income/(expense) in the Consolidated Statements of Earnings.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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